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azamat
3 years ago
13

Which of the following is an example of a force? A. electrons moving toward a positive charge B. a child kicking a soccer ball C

. air pushing against a falling object D. all of the above
Physics
2 answers:
Andre45 [30]3 years ago
4 0

Answer:

option (d)

Explanation:

A. When an electron is moving towards a positive charge, it means there is a force of attraction between electron and positive charge.

B. When a child kicks a football, it means he is applying a force on the ball.

C. When air pushes against the falling object, it means there is an opposing force acting on the object.

Lisa [10]3 years ago
3 0
I believe it would be d. all of the above!
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You are traveling on an interstate highway at the posted speed limit of 70 mph when you see that the traffic in front of you has
vovikov84 [41]

Answer:8.75 s,

136.89 m

Explanation:

Given

Initial velocity=70 mph\approx 31.29 m/s

velocity after 5 s is 30 mph\approx 13.41 m/s

Therefore acceleration during these 5 s

a=\frac{v-u}{t}

a=\frac{13.41-31.29}{5}=-3.576 m/s^2

therefore time required to stop

v=u+at

here v=final velocity =0 m/s

initial velocity =31.29 m/s

0=31.29-3.576\times t

t=\frac{31.29}{3.576}=8.75 s

(b)total distance traveled before stoppage

v^2-u^2=2as

0^2-31.29^2=2\times (-3.576)\cdot s

s=136.89 m

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3 years ago
27b. You're in an airplane that flies horizontally with speed 1000 km/h (280 m/s) when an engine falls off. Ignore air resistanc
jonny [76]

Answer:

8400m

Explanation:

The engine that falls off would have the same constant horizontal velocity as the airplane's when if falls off if we ignore air resistance. So it would have a horizontal velocity of 280m/s for 30seconds before it hits the ground.

Therefor the horizontal distance the engine travels during its fall is

280 * 30 = 8400m

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He needs to improve his endurance time.
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Answer:

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